What Should I Do If The Servo Is Shaking On Its Own? Insufficient Power Supply Causes The Servo To Vibrate. What To Do?

Have you ever encountered this situation? The steering gear was obviously installed properly, and when the power was turned on and it was about to start a big fight, it started to vibrate nervously, or started to turn on its own without any instructions. Don't worry, this is an "entry gift" that almost everyone who playsservos will encounter. To put it bluntly,when theservomoves on its own, it essentially means that it has received confusing instructions, or there is something wrong with the working environment. Today, let's put aside those obscure terms and just like chatting, to completely understand this annoying matter.

Why does theservomove on its own?

In fact, the steering gear is like a somewhat stubborn "worker". If you give it a clear pulse signal, it will turn to the corresponding angle. When it moves on its own, it usually means the signal is "flavored". The most common situation is insufficient power supply. Just like a person working on an empty stomach, his hands will naturally shake. If the current is unstable, the circuit board inside the servo will misjudge the command and produce irregular jitter or rotation. You can try changing to a more powerful power supply, or supplying power to the servo separately, instead of crowding it with the main control board, and the problem will often be solved.

How to judge whether the steering gear is faulty

If your power supply is proper, then we have to check whether the servo itself is "sick". A simple way is to gently hold the output shaft of the servo with your hands and feel its vibration. If it is a very regular, fine jitter, it is usually signal interference; if it feels like a stuck, "twitching", it is likely that the potentiometer inside the servo is worn, or the reduction gear set is physically damaged. Especially when you hear an abnormal "clicking" sound, you can basically conclude that the gear is grinding. At this time, don't hesitate and just try a new servo, which is the most worry-free.

Will the control code rotate if it is written incorrectly?

To play with the servo, code is the key. Many timesthe servo moves by itself. You really can't blame the hardware. You have to ask if your code has given it "ecstasy". For example, if you initialize the servo without giving it a clear angle, it will stop at a random initial position. Or in the loop statement, you forget to add a delay, causing the servo to jump back and forth between several angles at an extremely fast speed, making it look like it is shaking wildly. Check your code to make sure you give a fixed angle during initialization and leave enough reaction time for the servo to move in place between control commands.

How to completely solve signal interference

This is a problem that is particularly common in complex projects. The control line of the steering gear is like an antenna. If you tie it with the high current line of the motor, the electromagnetic interference generated by the motor running will be strung into the signal line, causing the steering gear to "go crazy". The solution is also very simple, just do a good job of "isolation". One is to keep the servo signal line as far away from the power line and motor line as possible; the other is to put a pull-up resistor of about 10kΩ on the signal line, or a small resistor in series, which can effectively filter out clutter and allow clean signal transmission.

What kind of controller should I use to make it stable?

Choosing the right “brain” is half the success of the project. For those who are new to servos, a classic control board like Uno is very friendly. The PWM signal it outputs is very stable and the library files are also very complete. If your project needs to drive many servos at the same time, such as making a robot, then you should consider a servo driver board, such as a module, which can communicate through I2C and use one board to control 16 or more servos. It can also be connected to an external independent power supply, which greatly reduces the burden on the main control board and improves stability.

How to quickly troubleshootif the servo moves automatically

Don't panic when you encounter problems, follow the steps for the highest efficiency. ️The first step is to touch the servo and feel the vibration type. ️The second step is to check the power supply to see if the power is insufficient or the wiring is loose. ️The third step is to check the code to see if you forgot to give the initial angle or delay. ️The fourth step is to disassemble the signal and use the DuPont wire on hand to directly give the servo a simple test signal to eliminate errors in the complex logic of the program. If it still doesn't work, remove the servo separately and test it with another good control board. This way you can quickly identify whether the problem is with the servo itself or with your circuit design.

After talking so much, will you feel confident next time you encounter the steering gear "twitching"? In fact, many times these basic small details are not noticed. What other weird problems related to steering gears have you encountered when working on projects? Or what particularly good solution have you used? Welcome to share it in the comment area, let's communicate together, maybe your experience can help another friend who is scratching his head. If you find the article useful, don’t forget to like and share it so that more people can see it!